Electric connection for automobile-lamps.



I. G. KEARBY L Z. ROBINSON. ELECTRIC CONNECTION FOR AUTOMOBILE LAMPS.

APPLICATIONl FILED MAY I3. i916- Patented Sept. 11, 1917.

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UNITED STATES Partnr 50H15 GLLATIN' KVEAEBY AND ZEPili-Ibillil'Ill ROBINSON, OF MINERAL WELLS, TEXAS.

v'ET ECTREC CONNECTION FOR ATOMOBLE-LAMP@ ticularly to lthe arrangementand construction of `thelead in connections -within the plug and leading to the terminals of the eretofore in automobile lamps wherein the current has been supplied from the magneto. to the lights, perceptible variations in illumination were caused in stopping, starting or slowing down. ln l,other words if the lamps were arranged so as to give full illumination only when full speed of the 'automobile was transferred to the magnetov` then when the automobile was traveling at' a low or relatively low speed the lights did not receive sullicient current and were dim. In the usual practice of making connection betweenthe terminals of' theV magneto circuit and the terminals of the lamp, a plug of hard'rubber, or similar insulating 1naterial, inclosed two ,relatively large wires of conducting metal and each wire connected one terminal of the magneto circuit with one terminal of the lamp.

We have found that byrearranging these interior conductors within the plug and by connecting a terminal ofthe lamp not only with a terminal conductor within the plug, but with the metallic socket holding the lamp, an increased and constant flow of current from 'the vmagnetoto and through the larnp will be secured irrespective of the variations .in the speed at which the autos mobile ravels and the magneto is run. IThe invention is particularly designed to improve the present lighting system on cars, which has the objectional feature that while the engine is running fast the light is satisfactory, but when the engine is running slowly the lights are never bright enough.

In carrying out our invention, one relatively large metallic conductor within the plug remains the same and leads the current directly from one terminal of the lamp. but

Speceation of Letters Patent.

Eatented Sept. 1L 492W.

" Application led May 13, 1916. Serial No. 97,433.

the other relatively large conductor is rearranged so that it initially leads from the second terminal of the magneto current directly to the first conductor within the plug. rlhe second terminal of the lamp communicates directly with an end of Athe second conductor wholly cut out-or cut away from the other end of said conductor and this disconnected end of the second conductor leads by pin vor other suitable'metallic connection to the metallic socket piece in which the lamp is inserted.

The nature and scope of our invention will be more liully understood Jfrom the following description taken in connection with the accompanying drawings forming a part hereof, in which- Figure l, is a side elevational view partly in section of an automobile headlight and lamp with conductor plug embodying the main features of my invention;

Fig. 2, is a similar View enlarged but -with the plug sectioned vto show the interior metallic conductors;

K Fig. 3, is a detail sectional view takento illustrate the detached end of the second conductor and its connection with the framing and metallic socket piece of the headlight, and

Fig. 4, is a cross-sectional view taken on the line 4.-4 of Fig. 2. y

Referring to the drawings, 1 represents the framing, 2 the reflector and 3 "the incandescent electric lamp of an automobile headlight. The lamp 3 is of the usual carbon or metallic iilament type and has in its base the two terminals for the lead in wires of the lamp. The lamp 3 locks by preference with a bayonet joint, in the metallic socket piece 4 which is tubular and in electric contact with a sleeve 5 of the framing .1 of the iight.

The socket piece 4 and sleeve 5 project bevond the framing 1 to receive one end of the L plug 6.- Irlhis plug 6 is made of insulating materil such as hard rubber and in its preferred form is in the shape of a rounded or square elbow.

The inner end of this plug 6 is provided with two metallic studs 7 and 8 whereof one, 7, forms the terminus for a relatively large metallic conductor 9, terminating at the outer end of the plug 6 in a binding post 10. The other metallic stud 8 penetrates some distance into the interior of the plug in the form of a relatively large metallic conductor lill 11 and is connected with or terminates in a metallic pin 12 traversing the plug diametrically (see Fig. This pin 12 enters and traverses a bayonet slot 13 at the outer end of socket piece 4 and is in electrical contact with said piece 4 and With the tube 5 of the framing 1. v

At the outerend of the plug 6 adjacent to the binding post 10 is a second binding post 14 connected by a relatively larger' conducting bridge piece 15 directly With the conductor 9 above binding post 10.

Between the base of lamp 3 and the inner end of plug 6 and Within the socket piece 4L is secured a nonconducting disk 16 provided with and traversed by the tWo Contact pins 17 and 18 so 'arranged that when all the parts are in position the pin 17 connects one.

other wire operates merely. as a connection to the lamp on the other side of the automobile. Magneto is changed to a multiplesystem by the device. In case of eitherlamp breaking the other will continue to burn. The return -from the lamp is to the framing 1. In actual use this arrangement of the conductors inthe plug results in increased light from the lamp and in a steadiness'of illumination under varying speed of the vehicle which has heretofore been absent.

Having thus described the nature and 0bjects of our invention what ive claim as new and desire to secure by Letters Patent is- 1. An electric connection for automobile lamps consisting of a plug of insulating material, a relatively large conductor extending through the plug and positioned to connect with a terminal of the lamp, an electric conductor connecting with the framing` of the lamp and extending part way into the plug, a relatively short conductor connected to the latter conductor and positioned to connect with the other lamp terminal, and a conductor extendino' only part Way into the plug anid' connected1 to the first named con ductor. A

2. An electric connection for automobile lamps consisting of a plug of non-conducting material, tivo binding posts embeded in theplug and arranged so that one receives a wire from themagneto and the other receives a Wire leading to the lamp on the other side of the automobile, -a relatively large conductor traversing the plug Tam? forming an extension for one of the bindin; l

posts, the other post being electrically con'- nected With the aforesaid conductor, an ele tric conductor arranged to connect with one of the terminals of the lamp, and an clertrical conductor leading from the aforos i conductor to the socket piece or frame o, lamp.

3. An electric connection for automobiles. consisting of a plug of non-conducting mate rial, an electrical conductor traversingthe plug, a second electrical conductor only par tially traversing the plug, and arranged to contact with a terminal of the lamp, an electrieal conductor from the lamp :traine or socket piece to the aforesaid short conductor' Copies o! this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G. 

